Question

It is 170 miles from Bruce's house to the city where his brother lives. On his last trip to visit his brother, he drove for 2 hours at 55 miles per hour. Then he came to some very bad road construction. The rest of the trip took 2 hours. How many miles per hour did Bruce drive for the rest of the trip?

Answer 1

Step-by-step explanation:

let the speed for the rest of the trip be = x

Distance = 170 miles

for the 1st time distance covered = (2*55)miles

= distance covered by 2nd time = (x*2) miles

so ,

2x + 110 = 170

x = (170- 110)/2

x = 30 miles per hour